If your Samsung SM-A750F phone has copy touch and running on Binary 4 U4 then it will not respond if you have flashed or made FRP.
FRP Lock Must be off.
Then using OTG you have to Enable OEM Lock.
Binary 4 Touch File: Download
1- Put phone in Download mode using Power + Volume Down + menu then Tap once Volume UP to enter download mode.
2- Download the file & select Zip file in AP or PDA, CP, BL and HOME CSC.
3- Click on Start. After flashing gets completed plus out battery.
4- Hard reset using Power + Volume UP+ Menu.
Then Reboot the phone.
Touch will start to respond.